Fig. 2: Example heart rhythm waveforms extracted by our system along the ground truth ECG waveforms.
From: Using smart speakers to contactlessly monitor heart rhythms
The acoustic waveforms include both in-phase and quadrature-phase components after beamforming. The cardiac rhythm signal shifts between the in-phase and quadrature-phase components due to residual respiration motion that remains after beamforming. The vertical dotted lines show the segments computed by the segmentation algorithm, which combines data from both in-phase and quadrature-phase components. The figure shows the waveforms for a A healthy participant and B atrial fibrillation patient.
